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Rachel de Thame explains how to create space in summer borders by lifting tulip bulbs that have finished flowering, and offers tips on storing them over summer, before replanting in autumn.early summerMore on growing tulipsPlant up a pot of tulips

-purpose compost, to ensure a balanced potting mix.Make a hole in the centre of the compost, remove climbers from their pots and plant 15cm apart. Firm the compost around the climbers, making sure there are no air pockets around the rootballs.Place the willow

, with yellowy pink blooms. Height 110cm.Dahlia 'Preference'Large-flowered cactus type, needs staking to support stems. Height 120cm.Dahlia 'Reputation'Giant-flowered semi-cactus dahlia. Grow in rich soil for best results. Height 140cm.Dahlia 'Rev P Holien

Sown now in the greenhouse, dahlia seeds will produce young plants ready to plant outdoors in late May to flower this year. Seed companies sell a range of quick-growing bedding strains that are suitable for growing this way. You can also use

Learn how to pinch out and pot on sweet peas with Sarah Raven's step-by-step video guide.springMore advice on growing flowersGrowing sweet peas from seedGrowing lupinsHow to create a cut flower patchPlanting out cerinthes